Bolt-finishing machine



fies. 10 1929. H. CREHAN ET AL 1,738,642

BOLT FINISHING MACHINE il r h 1925 4 Sheets-Sheet 2 INVENTDRS HubertGraham 1* -a.-nd WfIHamACre'ha-n 10, 392., H. CREHAN El AL.

BOLT FINISHING MACHINE Filed March 13, 1925 4 Sheets-Sheet 3Jllllllllllv INVENTURS .Huber'l C'reham by awhZ-D H. CREE-IAN AL BOLTFINISHING MACHINE Filed March 15,

1925 Sheets-Sheet 4 INVENTURS H ber? Crehem Patented Dec. 10, 1929"UNITE-o STATES PATENT OFFICE.

fiUBE'B'I OBEHAN AND WILLIAI A. OBEHAN, O1 PITTSBURGH, PENNSYLVANIAnom-rmrsnme momma.

Application ma March 13, m; Serial m. 15,249.

This invention relates to a bolt finishing machine, and constitutes animprovement over the machine of Patent No. 1,420,410,

' granted June 20, 1922, to Hubert Crehan.

5 The machine of such patent comprises a plurality of spindles, carryingoperating heads, which are advanced by means of a set screw on thespindle and a nut intermittently engagin such set screw. In such machinethe spin es carrying the pointing, thread cut-' ting, and nut attachingheads of the machine are simultaneously advanced to operate upon threebolts. A bolt carr g head or turret, the movement of whic is controlledby movement of the spindles, advances thebolts upon the operating headswith a step by step movement to present each individual bolt to thethree operating heads successively, ,This control is effected bytripping means actuatedfby the movement of one of the spindles itse 'Oneobject of the invention is toprovide improved and simplified means foradvanc g a spindle which carries a pointing or nut attaching head.Another object of the invention is to provide means actuated b the meansfor advancing one of such spin les for controlling the step by stepmovement of the bolt carrying turret.

A further object of the invention is to pro-' vide simplified andimproved means, actuated bythe turret actuating means for producingforward movement of the spindle which carv A still further object of theinvention is to provide improved actuating connections for the boltcarrying turret, which prevent movement of the turret if any obstructionto such movement should be presented. Inthe accompanying drawings Figure1 is a plan view of the bolt finishing machine of the present invention;Figure 2 is a side elevation thereof; Figure 3 is a vertical sectionalview on the'line 3-3 Figure 1; Figure 4 is a vertical sectional view onthe line 4-4 Figure 2; Figure 5 is a longitudinal sectional detail viewof the means for engaging the actuating shaft of the'bolt carryingturret for rotation thereof; Figure 6- is a vertical ries the threadcutting head of the machine.

sectional view of the means for controlling advancement of the spindlewhich carries the thread cuttmg head, taken on the line 6-6 Figure 1;Figure 7 is a front-elevation of the portion of the machme, showing indetail the bolt carrying turret and the means for actuatmg the same; andFigure 8 is a similar but fragmentary view, illustrating the action ofthe turret operating rod when an obstruction to the rotation of theturret is encountered,

The machine, as a whole is mounted upon a suitable table 1, andcomprises primarily the bolt carrying turret 2, a pointing head 3, ascrew threading head 4, and a nut attaching head 5. These heads aremounted respectively on spindles 6, 7 and 8, all of which have hearingsin the two standards 9 and 10. The bolt carrying turret 2 is mounted ona shaft 11, having bearings 12 and 13. All the elements of the machineare actuated by means U of a main shaft 14, having hearings in thestandards 9 and 15, and which has. thereon aulley 16 for the attachmentof a driving lt. On the main shaft 14 is a pinion 17 meshing with a gear18, which in turn meshes.

with a similar gear 19. The stub shaft 20 to which gear 19 is keyedcarries a pinion 21 meshing with the cam gear 22. Cam gear 22 has on itsforward face a cam 23 having an inclined surface which bears against therounded end 24 of the spindle 6 during a portion of each revolution ofthe cam.

Rotation of the spindle 6 is produced by p means of a gear. 25, carriedby the spindle, and which meshes with a wide gear 26 on the main shaft14. With this wide car 26 also mesh a gear 27, on the spindle 7 w ichcarries the thread cutting head, and a gear 28 on the ipirtildle 8which-carries the nut attaching Onthe shaft 29 of the gear 18 is apinion- 30, similar to the pinion 21, which meshes with the cam gear 32.This gear carries a cam 33 similar with that on the gear 22, andwhichbears against the rounded .end 24 of the spindle 8 which carriesthe nutattaching head of the machine. After their forward movement, andwhen they ride 01f the cams 23 and 33, each spindle is forced rearwardlyby a compression spring I A 34, which surrounds the spindle and bearsagainst the standard 10. The means for producing step by step rotationof the bolt carrying turret is actuated and controlled by the same meanswhich produced forward movement of the pointing and nut attachingspindles. Such means comprise the gear 18, which meshes witlra gear 35.This gear is free on the actuatrn shaft 36 for the bolt carrtyin turret2, whic' shaft is mounted in stan at s 37, 38, and 39. Keyed to theshaft 36 and abutting the gear 35 1s a collar 40. This collar 40 isprovided with a ke 41 whichis forced by a coiled spring 42 into alocking recess 43 m gear 35, to mutually enga e the gear 35 with thecollar 40 and the sha 36 with which it is rigidly connected. The key 41is held out of locking recesses 43 by means of a latch hook 44 which ispivotally mounted on a shaft 45 on standard 38, and which is arranged toenter a recess in the ke 41. A helical spring 46, connected with t eoverhanging support 47 normally holds the latch hook 44 in engagementwith the collar 40 and in the recess of ke 41. The latch mechanism asabove described, is identical with that illustrated and .described inthe patent noted above. The mechanism for tripping the latchis,-however, novel, and presents an improvement over the mechanism ofsuch patent. This mechanism comprises a rod 48, which is secured to thelatch hook 44 and to thearm 49" of a bell cranklever 49, which ispivotally mounted on the shaft 29 of gear 18 and pinion 30. Cam gear 32has thereon a dog or tripping member 50, which extends beyond theperiphery of the gear at a point not occupied by the cam 33. Followingforward movement of the spindle 8, this dog 50 comes into contact withthe arm 49 of the bell crank lever 49, and raising this arm depressesthe arm 49 of the lever.

Arm 49" of the lever being depressed withdraws the latch hook 44 fromthe recess in the key 41, against'the resistance ofthe heli-' cal spring46. The coiled spring 42-is thus permitted to force key 41 into thelocking recess 43 in the gear 35, to connect the gear 35 With collar 40and produce rotation of the shaft 36.

It will be noted by reference to Figure 4 of the drawings, that the dog50 has a rounded extremity, and that the arm 49 of the bell crank lever49 has a concave surface 51 for the contact of the dog. As longtherefore as the dog 50 remains in contact with the surface 51 of thelever arm latch hook 44 is kept from engagement with the recess 45 inthe key 41. As soon, however, as the dog 50 passes beyond the arm 49* inrotation of the ,cam gear 32, spring 46 is permitted to again bringlatch hook 44 into engagement with the recess 45 in the key 41. Thelatch hook 44 is beveled, as shown in Figure 2, so that it is enabled 7those described for advancing the ily made such'that'the shaft 36 isgiven but a single revolution before it is again disconnected from thegear 35.

. It is desirable that means differing from ointing "and nut attachingspindles be used on the screw threading spindle 7. .The immediate meansfor engaging and advancing the'spindle correspond in general to thosedescribed and claimed in patent to Hubert Crehan No! 1,327,312 datedJanuary 6, 1920, and atent to-Hubert Grehan No. 1,420,410 date June .20,1922. With particular reference to Figure 6 of the drawings, suchmechanism comprises a segmental nut 52, carried by a bell crank lever53pivotally mounted on a shaft 54 in supports 55. Engaging by means of ashoulder 56 with the lever 53 is a latch lever 57, which when inengaging position serves to lock the segmental nut 52 in engagement.with a screw threaded portion 58 on the spindle 7. As the spindle isbeing constantly rotated, this engagement causes it to travel for wardcarrying with it its operating head.

Arranged to be carried forward by the spindle 7 is a guide frame 59, onone of the rods 60 of which is carried a cone 61. When forward movementof the spindle has progressed to a predetermined point, the cone 61,coming into contact with the latch lever 57 forces its shoulder 56 outof engagement with the nut suppdrting lever 53, permitting the lever 53to drop carrying with it the segmental nut 52. This action is assistedby a spring 62 .bearing against a central block 63 and against the lowerportion of the nut supporting lever 56.

Upon disengagement of the segmental nut 52 from the screwthreadedportion 58 of the spindle 7 the spindle is carried rearwardlv bymeans of a bell crank lever 63 pivoted at 65 in the table 1, and havingits lower arm 64" provided with a counterweight 66. This rearwardmovement is continued until the guide frame 59 comes into contact withthe standard 9, and the screw threading head 4 comes into contact withthe standard 10.

It is to be understood that the rearward movement of the spindles 6 and8 may be si-' multaneous with that of the spindle 7 under the forceexerted on them by the compression springs 34; or the other spindles maylead t e screw threading head, in order to allow more time for theoperations of the nut at mechanism to e with the screw t readed portion58 of the spindle for advancin it the bolt carrying turret acts on thecollar 71 to produce movement of lever 70, link 69, and shaft 68, tooperate the cam 67. When the v levers of the spindle engaging mechanismare in their disengaged and operative position, oscillation of the cam67 causes the cam to strike the lower portion of the nut supportinglever 53, which has been forced outwardly by the spring 62. This action,assisted by a spring 74 bearing against central block 63 and the lowerportion of lever 57, causes the upper portions of the levers 53 and-57to be forced upwardly into such position that the shoulder 56 of thelatch lever 57 again engages the nut supporting lever. The segmental nut52 is thus again brou ht into contact with the screw threaded portlon 58of the spindle 7 for advancing the spindle.

It will be understood that the arrangement of shaft 68, links 69, leverarm 70,.and

collar 72, may be such that the last movement of rotation of the shaft36 actuates the age the segmental nut 52 the spindle. The spindle is notadvance therefore, until the bolt carrying turret has come to rest inproper a position.

Mechanism, indicated generally by the reference numeral 75, for feedingnuts to the nut attaching head of the machine is supported by thestandard 38. It is unnecessary to describe this mechanism herein, as itis I cfully disclosed in the two prior patents to Hubert Crehan abovenoted, and as its mechanism has no direct bearing upon the novelfeatures of the invention. The structures of I the three Working heads3, 4, and ,5 of the machine are also not described, nor illustratedindetail herein; because they are fully described and illustrated in theprior patent to Hubert Crehan No. 1,420,410 dated June 20, a 1922. Y

" The bolt carrying turret'2, and the actuating connections therefor,are similar to the turret and connections of Patent No.

1,420,410, except in one important detail of construction. The boltcarrying turret supports a pluralityof bolt holding chucks 76, forpresenting a bolt in operative relation'to the pointing head- 3, threadcutting head 4,

j and nut attaching head of the machine. In order to present three boltssimultane- I ously for these three operations, it is necessa ry that theturret be rotated with a step by step movement, and locked in positionbetween steps with the bolts in proper position i it before theoperating heads.

reference to igure 7 of the drawings, comprise an operating arm 77eccentrically. conace of the-gear wheel 78,

nected with the which is rigidly mounted on the shaft 36. A drivingwheel or plate 79 is provided with a plurality of peripherally arrangedcuts or ledges 80, furnishing engaging shoulders 81. The operating rod77 is connected with an arm 82, which is rotatably mounted on the hub ofthe driving wheel or plate 79. Pivoted on the arm 82 is an actuating dog83 arranged to engage shoulders 81 on the driving wheel or plate. Inrotatin the turret 2, rotation of shaft 36 and gear 8 causes theoperating rod 77 and arm 82 to first disengage the dog 83 from theshoulder 81 of the driving wheel against which it lies, and to drag itbackwardly until it enters the next succeeding cut or ledge of thedriving wheel or plate. The further action of the operating rod 7 7,

during the same rotation of shaft 36, causes the dog to engage theshoulder 81 of the succeeding ledge and to rotate the turret one step. I

The means for positively locking the turret 2 after a'single forwardstep comprise a locking wheel 84, rigidly secured to the tur-,

ret shaft 11 and having in its periphery a arm 86 carrying a suitablelocking piece 87 arranged to engage in the recess 85. Lever arm 86 issupported on shaft 36 between a .collar 88 and a bearing 89 in thestandard 39,

and has connected therewith a spring 90 arran ed to exert a forcetending to maintain t e locking piece 87 in one of the locking recesses85. Lever arm 86 is lifted'intermittently by means of a cam 91, which ismounted on the shaft 92 of a gear 93. The gear 93 is actuated by gear78, at an equal rate of speed therewith, and during each rotation ofthegear 78 with that of the shaft 36', the cam 91 serves to raise the leverarm 86 and cause the-locking piece 87 to be withplurality of lockingrecesses 85; and a lever 4 drawn from the recess in which it lies. Afterthe cam has passed the lever arm, the spring 90 forces the lever arminto such position that the locking piece 87 vengages the nextsucceeding notch, to hold the turret securely in proper position beforethe operating heads- Cam 91 is so positioned and designed with relationto the mechanism for positively rotating the turret that thedisengagement of the locking piece leads by an instant the rotatingimpulse imparted to the turret.

-In so far as described, the turret and mechanism for rotating the sameare identical with those shown and described in patent to 5 a'pin 97 onthe arm 82 which carries the dog T upper' portion of the rod.

heads should not be properly withdrawn before a rotating impulse of theturret, or that some other cause should produce material resistance-tosuch movement. For this purpose the operating rod 77 terminates in twotines 94, which arepivoted at 95 tov the The two titles 94 are cut outto rovide a rounded aperture ,or seat 96 for em racing 83. The two tines94 are normally held together to embrace the pin 97, by means of a pin98 in both tines, and a coiled spring 99 bearing against one-tine andagainst a nut 100 on the end of the pin 98.

If therefore any obstacle is presented to the movement of the turret,the tines 94 are spread by the action of the rod on the pin 97, andagainst the resistance of the coiled spring 99. The operating'rod 77therefore simply moves without affecting theposition of the pin 97 andthe arm .82 to which it is attached; there being no movement of this armexcept when the pin, 97 is engaged in the seat 96 and the tines 94 areheld together by the action of the spring 99. 1

What we claim is: g

1. In a bolt finishing machine the combination of a spindle, anoperating head on said spindle, amain shaft, a gear on said main shaft,a pinion on the spindle meshing with said gear for rotating the spindle,a second gear operatively connected with said main shaft, a cam on saidgear bearing directly against the end of the spindle op osite that whichcarries the operating head or advancing the spindle and o eratinghead, arotatable bolt carrier, a sha operatively connected with said boltcarrier for rotating the same, and a member on the gear carryingthespin- "dle advancing cam and positioned thereon I with respect to theoperating face of the spindle advancing cam for controlling rotation ofsaid shaft. a

' 2. In a bolt finishing machine the combination of a spindle, anoperating head on said spindle, a main shaft, a gear on said main shaft,a pinion meshing with said gear for rotating the spindle, a second geardriven from sa1d mam shaft, a cam on sa1d gear bearing directly againstthe end* of the spindle opposite that which carries the operating headfor advancing the spindle and operating head,

a rotatable bolt carrier, a shaftconnected with the bolt carrier forrotating the same, driving means, means for connecting said shaft withsaid driving means and a member carried by the cam gear andpositionedwith respect to the operating face of the cam for actuatingcarries the operating head for advancing the spindle'and o erat-inghead, a rotatable bolt carrier, a sha t connected with the'bolt car-.rier for rotating the same, driving means, a

member for connecting said shaft with said driving means, yieldinglymounted means for mamtalning sa1d connecting member out of operativeposition, a ivoted lever arranged to act upon said yiel 'ngly mountedmeans to release said connecting member, and a mem-' ber carried by thes indle advancing camarran'ged to act on sa1d pivoted lever.

4. In a bolt finishing machine the combination of a spindle, anoperating head on said s indle, a main shaft, a gear'on said mains aft,a pinion on the spindle meshing with said gear for'rotating the spindle,a second gear driven indirectly from said main'shaft,

a cam on said gear bearing ,directly against the end of the spindleopposite that which carries the operating head for advancing the spindleand o crating head, a rotatable bolt carrier, a sha connected with saidbolt carrier for rotating the same, driving means, a member forconnecting said shaft with said driving means, yieldingly mounted meansfor maintaining said connecting member out .of operative position, apivoted lever arranged to act upon said yieldingly mounted means torelease; said connecting'member, and a member carried by the spindleadvancing cam arranIged .to act'on said pivoted lever.

5. n a bolt finishing machine the combination of a main shaft, a rotatedspindle, a

rotatable bolt carrier, a shaft operatively connected with said boltcarrier for rotating the same, a drivinggear intermittently connectedwith said operating shaft, an intermediate gear meshing with saiddriving gear,-a pinion on the main. shaft meshing with-said inter-'mediate gear, a rotatable cam for advancing the spindle, means connectedwith said intermediate gear for rotating said cam, and means associatedwith said cam for controlling the connectionbetween said operating shaftand driving gear.

6. In a bolt finishing machine the combination of a rotatable boltcarrier, a shaft operatively connected with said bolt carrier forrotating the same, a spindle having an operating head thereon, means forengaging the spindle to advance the same, an eccentric connection withsaid operating shaft for actuating said spindle engaging means, meansfor actuating said shaft, a second spindle, means for advancing saidsecond spindle, and a member associated with one of said spindleadvancing means for controlling the actuation of said operating shaft.

7. In a bolt finishing machine the combination of a rotatable boltcarrier, a shaft operatively connected with said bolt carrier forrotating the same, a spindle having an operating head thereon, meansoperatively connected with said operating shaft and arranged to beactuated thereby to cause engagement of the spindle for producingforward movement thereof, means for actuating said operating shaft,asecond spindle having an operating head thereon, a rotatable cambearing directly on the end of the spindle opposite that which carriesthe operating head, and means associated with said cam for controllingactuation of said 0 erating shaft.

8. In a bolt finishing mac inethe combination of a rotatable boltcarrier, a shaft operatively connected with said bolt carrier forrotating the same, a spindle having an op-- erating head thereon,meansfor engaging said spindle to advance the same, an eccentricconnection' with said operatin shaft for actu ating said spindleengaging means means for actuatingsaid shaft, a second spindle having anoperating head thereon, a rotatable cam bearing directly on the end ofthe spindle opposite that which carries the O erating head, and meansassociated with said cam for controlling actuation of said operatingshaft.

In witness whereof, we hereunto set our hands.

HUBERT CREHAN. WILLIAM A. CREHAN.

